CGAL::Vector_2<Kernel>

Definition

An object of the class Vector_2<Kernel> is a vector in the two-dimensional
vector space ℝ2. Geometrically spoken, a vector is the difference
of two points p2, p1 and denotes the direction and the distance
from p1 to p2.

Cgal defines a symbolic constant NULL_VECTOR. We
will explicitly state where you can pass this constant as an argument
instead of a vector initialized with zeros.